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The file arch/i386/kernel/head.S is linked with the uncompressed
kernel. If the kernel is not compressed this is the only head.S used.
In a compressed kernel, all 32 bit objects from the kernel, including the above mentioned
head.o are compressed and the compressed data is lumped together in the file piggy.o.
Now the file arch/i386/boot/compressed/head.S comes into play. This and
the decompressor and piggy.o form a new 32-bit object.